Availability of access to online learning platforms is expected to support online learning activities amid the COVID-19 pandemic. There are several issues experienced by students in online learning activities. These issues are related to Internet access, learning content, and learning evaluation. Online learning platforms are indispensable to be able to provide good learning resources that are easily accessible to students. This study aims to explore data reviews on Google Play Store to perceive the priority of service improvements that need to be carried out by online learning platform providers. Topic modeling and sentiment analysis are applied to extract useful information based on user sentiment towards the topics discussed in the application review. The result of topic analysis shows that topic trends in user reviews are about Live Class, Tryout, Subject Matter, User Account, Tutorial Video, and Free Learning Access. Meanwhile, the result of NRS assessment identified aspects that need to be a priority for improving online learning platform services. These aspects are in the Tryout and User Account sections. On the other hand, the aspect of Free Learning Access received the highest NRS. Users are helped by having free access to all learning content during learning from home activities.

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Nearly half of Indonesia's population has dehydration. THIRST Research (2009) proves that Indonesian people is still low awareness of drinking water. Consuming enough water could be one way to prevent dehydration. Smart Bottle application is able to provide amount of daily water needs based on user profile that entered when registering account. The problem in the calculation of water consumption can be overcome by using the data of the waterflow sensor calculation. Implementation result of Smart Bottle application has proved that the water needs of each person can be known, the water that has been consumed can be calculated automatically, and push notification can be able to give reminder about water drinking to Smart Bottle users during their busy. In this paper, hybrid application for android has implemented using Ionic Framework and Laravel, then push notification using Firebase Cloud Messaging.Keywords : Daily water needs, Firebase Cloud Messaging, hybrid application, water consumed calculation, waterflow sensorABSTRAKNearly half of Indonesia's population has dehydration. THIRST Research (2009) proves that Indonesian people is still low awareness of drinking water. Consuming enough water could be one way to prevent dehydration. Smart Bottle application is able to provide amount of daily water needs based on user profile that entered when registering account. The problem in the calculation of water consumption can be overcome by using the data of the waterflow sensor calculation. Implementation result of Smart Bottle application has proved that the water needs of each person can be known, the water that has been consumed can be calculated automatically, and push notification can be able to give reminder about water drinking to Smart Bottle users during their busy. In this paper, hybrid application for android has implemented using Ionic Framework and Laravel, then push notification using Firebase Cloud Messaging.Keywords : Daily water needs, Firebase Cloud Messaging, hybrid application, water consumed calculation, waterflow sensor